Misfire

motomartin11 · 02-12-2022, 08:52 PM

Further update-fuel system cleaned again, carbs ultrasonically cleaned again, carbs full of silt (again), idle jet on rear cylinder carb blocked (again),pump contaminated shutting off pressure relief valve.
Carbs were put back on today-misfire returned on rear pot. Coils were swapped to no avail. Remote tank set up but misfire still persisted on one pot. Further checks threw up possible CDI black box issues. Luckily a set off a 600 were sourced on a loan basis and both boxes were swapped as I understand one faulty black box can result in the other being affected. Engine then ran reliably on BOTH pots. Had to order a pair of new CDI boxes off Fleabay Germany...Now awaiting delivery of fuel pump hit, manaul fuel tap, fuel filter and new CDI boxes..........

02-12-2022, 08:52 PM	#11
motomartin11 Registered User Join Date: Sep 2010 Location: stourbridge Bike: M750 Posts: 371	Further update-fuel system cleaned again, carbs ultrasonically cleaned again, carbs full of silt (again), idle jet on rear cylinder carb blocked (again),pump contaminated shutting off pressure relief valve. Carbs were put back on today-misfire returned on rear pot. Coils were swapped to no avail. Remote tank set up but misfire still persisted on one pot. Further checks threw up possible CDI black box issues. Luckily a set off a 600 were sourced on a loan basis and both boxes were swapped as I understand one faulty black box can result in the other being affected. Engine then ran reliably on BOTH pots. Had to order a pair of new CDI boxes off Fleabay Germany...Now awaiting delivery of fuel pump hit, manaul fuel tap, fuel filter and new CDI boxes..........